Investigation of the mechanisms of upconversion luminescence in Ho3+ doped CaF2 crystals and ceramics upon excitation of 5I7 level

Hydrothermal synthesis, crystal structure and Photoluminescent properties; 3D Holmium(III) coordination polymer

“…These transitions can be assigned to the ligand-to-metal charge transfer (LMCT) which are in agreement with the previously reported emission spectra of Ho(III) compounds [38][39][40].…”

Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes

“…It is well‐known that natural fluorites contain rare earth ions, and many optical spectra of rare earth ions in CaF 2 have been reported, although somewhat scattered in the literature. [ 1–56 ] With the increasing availability of Raman microscopes for mineral characterizations, it appears that these instruments can equally be used to probe with high resolution the luminescence of the rare earth ions which can be excited with 532 nm and other laser excitation, not only for rare earth in fluorites but also in other rare earth containing minerals. Previously, laser excited luminescence of rare earth ions in fluorites has been demonstrated using the Ar ion laser lines ranging from 364 to 514.5 nm.…”

Характеристики апконверсионной люминесценции порошков CaF-=SUB=-2-=/SUB=- : Er при возбуждении лазерным излучением с длиной волны 1.5 μm

“…Интенсивная апконверсионная люминесценция характерна для фторидных материалов со структурой флюорита MF 2 : RE (M = Ca, Sr, Ba) [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Это обусловлено тем, что данные материалы характеризуются низкой энергией фонона (∼ 466 cm −1 , CaF 2 [25]) и склонностью ионов активаторов к образованию кластеров даже при их малых концентрациях [26][27][28][29].…”